unsupplied?
Returns true if its argument is equal to the unique “unsupplied” value, and false if it is not.
Exported from
Module common-dylan
Module common-extensions
Arguments
arg
An instance of
<object>
.
Values
val
An instance of
<boolean>
.
See also
supplied?
unsupplied
The common-dylan module.
Miscellaneous extensions to the Dylan language.
The class of all Dylan objects.
The class of boolean values.
Returns true if its argument, the keyword argument of a function, is not the unique “unsupplied” value, and false if it is.
Returns the unique “unsupplied” value.